HP Vectra Technical Reference Manual page 361

8.2.2 Parallel Printer Port Addresses
The I/O port addresses of up to four parallel printer adapter ports are stored in these four words.
40 :008H
02 S40_PRINT_PORT1--ADR
40 :OOAH
02 S40_PRINT_PORT2--ADR
40:00CH
02 S40_PRINT_PORT3--ADR
40:00EH
02 S40_PRINT_PORT4--ADR
8.2.3 Equipment 8yte Data Area
Address of parallel port 1
Address of parallel port 2
Address of parallel port 3
Address of parallel port 4
This data area contains several words describing some of the optional hardware installed in the
system.
40:010H
02 S40_EQUIPMENT_FLAG Installed devices word
(see table B.3)
40:012H
01
S40_MFG_INIT Manufacturing initialization/test byte
40:013H
02 S40_MEMORY_SIZE Memory size in 1k bytes
40:015H
01 S40_MFG_ERLFLAG 1 Manufacturing scratchpad
40:016H
01
S40_MFG_ERLFLAG2 Manufacturing error codes
352 Memory Map